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Diodes Incorporated APX809S-26SAG7
- Part No.:
- APX809S-26SAG7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-26SAG7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
APX809S-26SAG7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +2.5V to +5V rails. It provides active-low push-pull reset assertion when VCC falls below 2.63V (typ), maintains reset for ≥240ms after recovery, and operates reliably down to VCC = 1V with only 7µA supply current. Used in portable equipment and embedded controllers for power-on reset and brownout protection.
For engineers reviewing the APX809S-26SAG7 datasheet, APX809S-26SAG7 pinout, APX809S-26SAG7 application, or APX809S-26SAG7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), guaranteed operation at 1V supply, 240ms timeout stability over temperature, and SOT23-3 footprint compatibility with space-constrained PCB layouts.
Technical Context
The device implements a precision bandgap-based voltage comparator with internal hysteresis to reject fast VCC transients. Its reset logic is fully static-no external timing components required-and output state is guaranteed valid across the full operating range (−40°C to +125°C) with no minimum VCC dependency beyond 1V.
Reset assertion is triggered solely by VCC crossing the 2.63V threshold; no manual reset input or watchdog timer function is present. The push-pull output drives high/low without pull-up resistors, supporting direct interface to µP RESET pins compliant with TTL or CMOS logic thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (typ), ±0.04V tolerance - ensures reliable detection of 2.6V nominal supply droop before system instability. |
| Reset Timeout | 240ms (min) - guarantees sufficient hold time for µP initialization after power recovery. |
| Supply Current | 7µA (typ) - enables multi-year battery life in coin-cell–powered IoT sensors and wearables. |
| Operating VCC Range | 1.0V to 5.5V - supports reset assertion even during deep brownout or ultra-low-power sleep states. |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor, reducing BOM count and board area. |
| Temp Coefficient | 30ppm/°C - maintains threshold drift <±15mV over −40°C to +125°C, critical for automotive under-hood use. |
| ESD Rating | HBM 6kV - protects against handling damage during assembly and field service without added TVS. |
Pinout & Package
SOT23-3 (SA package code) surface-mount package with 2.4mm × 1.3mm footprint, 0.95mm height, and gull-wing leads. RoHS-compliant, halogen-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-low push-pull output; sinks up to 3.2mA at 0.4V, sources minimal current when high - directly drives µP RESET pin. |
| 3 | VCC | Power supply input; monitors this rail for threshold violation; supplies internal circuitry down to 1V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold calibration | 2.63V ±0.04V at +25°C with 30ppm/°C drift - eliminates factory trimming and reduces test time. |
| No external components | Self-contained reset generator - removes RC network, saving 2–3 mm² PCB area and improving long-term reliability. |
| Guaranteed operation at 1V | Valid RESET output asserted even when VCC drops to 1.0V - enables fail-safe shutdown in deep undervoltage conditions. |
| Push-pull output architecture | Drives low without pull-up resistor and avoids floating state - prevents spurious resets during power sequencing. |
| Low-temperature drift | Threshold variation <±15mV across −40°C to +125°C - meets industrial and extended-temperature automotive requirements. |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC Controller |
|---|---|
Use Scenario: Coin-cell–powered environmental sensor transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Voltage detector asserting RESET during battery sag below 2.6V to prevent corrupted flash writes or UART transmission errors. Use Value: 7µA quiescent current extends 2032 battery life beyond 5 years; 240ms reset hold ensures full MCU boot sequence completion after voltage recovery. | Use Scenario: DIN-rail mounted programmable logic controller operating in factory environments with 24VDC input converted to 3.3V logic rail. IC Role / Device Role / Timing Role: Supervisory IC monitoring 3.3V domain, triggering hardware reset if switching regulator output dips due to load transients or EMI. Use Value: 30ppm/°C threshold stability maintains accuracy across −25°C to +70°C ambient; push-pull output interfaces directly with ARM Cortex-M4 RESET pin without level-shifting. |
| Medical Handheld Diagnostic Device | Automotive Body Control Module (BCM) |
Use Scenario: Portable ultrasound probe powered by rechargeable Li-ion battery with variable output between 3.0V–4.2V. IC Role / Device Role / Timing Role: Monitors regulated 3.3V supply to CPU and ADC subsystems, asserting RESET during battery discharge below safe operating voltage. Use Value: Valid operation down to 1.0V VCC allows detection of catastrophic battery failure before system lockup; SOT23-3 footprint fits tight space constraints near SoC. | Use Scenario: BCM managing door locks, lighting, and window controls in 12V vehicle electrical system with LDO-regulated 5.0V rail. IC Role / Device Role / Timing Role: Detects undervoltage on 5.0V microcontroller supply during cold-cranking (battery dip to 6V), initiating controlled shutdown. Use Value: 2.63V threshold matches 5V rail brownout margin; HBM 6kV ESD rating withstands assembly handling and in-vehicle ESD events without protection diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 2.93V fixed threshold, 140ms min reset timeout, 1.5µA ICC | Higher threshold unsuitable for 2.6V–2.8V rails; shorter timeout may not meet µP requirements. | Select only if system uses 3.0V supply and requires ultra-low current. |
| TPS3808G125DBVR | 1.25V adjustable threshold via external resistor divider, 200ms timeout, 1.1µA ICC | Requires two external resistors; adds cost, board area, and calibration uncertainty. | Choose when precise custom threshold (e.g., 2.62V) is mandatory and design tolerates added components. |
Compared with MAX809TRD2T and TPS3808G125DBVR, APX809S-26SAG7 delivers exact 2.63V detection with no external parts, guaranteed 240ms hold time, and robust 1V operation-making it optimal for fixed-threshold, space- and power-constrained designs.
Availability
APX809S-26SAG7 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, industrial PLC controllers, medical handheld devices, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APX809S-26SAG7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for low-cost, zero-component reset generation in space-constrained embedded systems where supply voltage monitoring must remain functional down to 1V.
FAQ
What is the exact reset threshold voltage for APX809S-26SAG7 at +25°C?
The reset threshold is 2.63V (typical), with a guaranteed range of 2.59V to 2.67V at +25°C per DS39140 Rev. 2–2. This value is laser-trimmed during production and remains stable across temperature with a maximum drift of ±15mV from −40°C to +125°C.
Does APX809S-26SAG7 require an external pull-up resistor on the RESET pin?
No. APX809S-26SAG7 features a push-pull output that actively drives LOW (≤0.4V at 3.2mA sink) and HIGH (≥0.8×VCC at 500µA source). No external pull-up is needed, simplifying layout and eliminating resistor tolerance effects on reset timing.
Can APX809S-26SAG7 operate correctly when VCC drops below 2.0V?
Yes. The device guarantees valid RESET output assertion and release down to VCC = 1.0V, as confirmed in the Recommended Operating Conditions table. Output logic states remain correct even during deep brownout, enabling safe system shutdown before data corruption occurs.
Is APX809S-26SAG7 pin-compatible with other SOT23-3 voltage detectors like the MCP102?
No. While both use SOT23-3, APX809S-26SAG7 has GND on Pin 1, RESET on Pin 2, and VCC on Pin 3. MCP102 places VCC on Pin 1 and GND on Pin 3 - physical pinout differs, requiring PCB redesign for substitution.
APX809S-26SAG7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S-26SAG7 FAQ
1.How can I place an order for APX809S-26SAG7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-26SAG7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for APX809S-26SAG7 reliable?
The price and inventory of APX809S-26SAG7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S-26SAG7 is usually 5 days.
3.What payment methods are accepted for APX809S-26SAG7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-26SAG7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-26SAG7?
APX809S-26SAG7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-26SAG7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for APX809S-26SAG7?
For technical support, including APX809S-26SAG7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-26SAG7 requirements.
6.How does Aetrix verify that APX809S-26SAG7 is sourced from the original manufacturer or authorized distributors?
All APX809S-26SAG7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that APX809S-26SAG7 meets industry standards.
7.What is the process for return or replacement of APX809S-26SAG7?
All APX809S-26SAG7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-26SAG7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The APX809S-26SAG7 part is unused and in its original packaging.
Return procedure for APX809S-26SAG7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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